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United States Patent (19) [11] 3,871,900 Hayashi Et Al

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United States Patent (19) [11] 3,871,900 Hayashi Et Al United States Patent (19) [11] 3,871,900 Hayashi et al. (45) Mar. 18, 1975 54 RECORDING SHEET 3,346,571 10/1967 Spatz et al..................... 1 7/36.2 X 3,632,376 1 / 1972 Newman.... ... l 7/36. X 75 Inventors: Takao Hayashi; Hajime Kato, both 3,664,858 5/1972 Huffman............................ | 17/36.8 of Fujinomiya-shi, Shizuoka; 3,767,449 10/1973 Hayashi et al................. 17/36.8 X Sadao Ishige, Minami Ashigara-shi, 3,769,062 10/1973 Ishige et al......................... 7/36.2 Kanagawa, all of Japan 3,772,052. 1 1/1973 Kimura et al...................... 117/36.2 (73) Assignee: Fuji Photo Film Co., Ltd., Minami Ashigara-shi, Kanagawa, Japan Primary Examiner-Thomas J. Herbert, Jr. Attorney, Agent, or Firm-Sughrue, Rothwell, Mion, (22 Filed: July 24, 1973 Zinn & Macpeak 21 Appl. No.: 382,224 57 ABSTRACT (30) Foreign Application Priority Data A recording sheet comprising a support having July 28, 1972 Japan................................ 47.75758 thereon a color developer layer capable of reacting with a color former to form color images, said color 52 U.S. Cl................................ 117/36.8, 117/36.2 developer layer containing (l) a metal compound of (51 Int. Cl.............................................. B41m 5100 an aromatic carboxylic acid and (2) at least one mem 58 Field of Search........................... 117/36.2, 36.8 ber selected from the group consisting of ethers and (56. References Cited alcohols. UNITED STATES PATENTS 19 Claims, No Drawings 2,663,653 21 1953 Zimmerman....................... 117.136.2 3,871,900 1 2 RECORDING SHEET Of these, a metal compound of an aromatic carbox ylic acid is particularly effective as a color developer. BACKGROUND OF THE INVENTION That is, a color developer sheet containing as a color 1. FIELD OF THE INVENTION developer a metal compound of an aromatic carboxylic The present invention relates to a recording sheet, acid has the following excellent properties in compari and more particularly to a recording sheet containing son with conventional color developer sheets. an improved color developer. l. Even when left in the air, reduction in color 2. DESCRIPTION OF THE PRIOR ART developing ability with the passage of time is small. Recording sheets utilizing a color reaction of an al 2. By using an aromatic carboxylic acid difficult to most colorless organic compound (hereinafter referred 10 dissolve in water, disappearance or reduction in to as a "color former') such as Malachite green lac density can be avoided even when the color former tone, benzoyleucomethylene blue, crystal violet ace on the color developer sheet is wet with water. tone, Rhodamine B lactam, 3-dialkylamino-7- 3. The light fastness of the colored image on the color dialkylaminofluoran and 3-methyl-2,2'-spirobi (ben developer sheet is excellent. Zof chromene), and an adsorbent or reactive material 15 4. Since sufficient color-developing ability can be ob (hereinafter referred to as a “color developer') capa tained using a small coating amount, workability in ble of forming a color when contacted with the color coating is very good. former are well known. As is described above the properties of the recording As the recording sheets practically using the phe sheet and the various problems encountered in the pro 20 duction thereof have been improved considerably by nomenon, there are a pressure-sensitive recording using a metal compound of an aromatic carboxylic acid sheet (see, for example, U.S. Pat. Nos. 2,505,470; as a color developer instead of the conventional color 2,505,489; 2,550,471; 2,548,366; 2,730,456; developers. 2,730,457; 3,418,250, etc.) and a heat-sensitive re However, there remain the disadvantages that, in the cording sheet (see, for example, Japanese Patent Publi 25 production of a metal compound of an aromatic car cation Number 460/68; U.S. Pat. No. 2,939,009, boxylic acid, the viscosity of the prepared (coating) so etc.). Further, a printing method is known wherein an lution increases and the particle size of the metal com ink containing the color former is applied to the color pound becomes coarse thereupon. Therefore, it is diffi developer sheet through a medium such as a stencil cult to prepare a stable coating solution and, unless the (see German Patent OLS No. 1,939,62, etc.). 30 particle size of the metal compound is made fine by In many cases, the above mentioned phenomenon of means of a ball mill or sand mill, there is room for im the color reaction between the color former and the provement in the color-developing ability and film sur color developer requires physical conditions such as face strength of the coated layer. pressure with a pen or with a key of a typewriter, heat, A primary object of the present invention is to im Ctc. 35 prove the color-developing ability of a color developer As the most representative embodiment of the re sheet containing a metal compound of an aromatic car cording sheets, there is illustrated a pressure-sensitive boxylic acid. copying paper. A pressure-sensitive copying paper may Another object of the present invention is to simplify be obtained by dissolving a color former in a solvent the steps for preparing a coating solution containing an such as chlorinated paraffin, alkylnaphthalene, alkyl 40 aromatic carboxylic acid. ated diphenylethane, alkylated diphenylmethane, or Further object of the present invention is to improve the like, dispersing the resulting solution in a binder or the coating characteristics of the coating solution con microencapsulating the solution, and then the coating taining an aromatic carboxylic acid. on a support such as paper, plastic film, etc. Still a further object of the present invention is to A heat-sensitive recording sheet may be obtained by 45 provide a color developer having the above-described coating a color former on a support together with a advantages. thermofusible material such as acetanilide. As used Still a further object of the present invention is to herein, the term "thermofusible material' means a ma provide a recording sheet having the above-described terial which is melted on heating to dissolve the color advantages. former. 50 In general, the color former and color developer may SUMMARY OF THE INVENTION be coated on the same surface or opposite surfaces of As a result of various investigations, it has been found a support, or on different supports. Also, the color de that the addition of at least one member selected from veloper may be coated on or impregnated into a sup the ethers and alcohols to a color-developing layer con port as an ink. 55 taining a metal compound of an aromatic carboxylic As the above-described color developer, clays such acid achieves the above-described objects. as acid clay, activated clay, attapulgite, zeolite, benton ite, etc.; organic acids such as succinic acid, tannic DETAILED DESCRIPTION OF THE INVENTION acid, gallic acid or phenol compounds, and acidic poly The ethers suitable for use in this invention can be mers such as phenol resins are known. Furthermore, a 60 represented by the formula, mixture of an aromatic carboxylic acid and a metal compound; a metal compound of a polymer of an aro ROX matic carboxylic acid having at least one hydroxy wherein X is -(CH2)OR', -(CH2)OH, - (CH group and an aldehyde; a metal compound of an aro ),OH, - (CH)OR', an alkyl group (preferably, matic carboxylic acid; a metal compound of a phenol 65 having up to 18 carbon atoms) or an alkenyl group compound having a pKa of not more than 8; and the (preferably, having up to 18 carbon atoms), R is an like, are effective as a color developer. alkyl group (preferably, having up to 10 carbon 3,871,900 3 4 atoms), an aryl group (preferably, having up to 10 car water-soluble metal salt may be reacted with each bon atoms) or an alkenyl group (preferably, having up other in optional porportions, but preferably, they are to 10 carbon atoms), R' and R' each is an alkyl group reacted in gram equivalent amounts. (preferably, having up to 18 carbon atoms), an aryl The metal compound of an aromatic carboxylic acid group (preferably, having up to 18 carbon atoms) or an 5 is a salt of such an acid such as a zinc, tin, aluminum, alkenyl group (preferably, having up to 18 carbon nickel, magnesium or calcium salt of an aromatic car atoms), p is an integer of 1 to 20 (preferably, 2 or 3), boxylic acid, and these salts can be obtained easily by and q is an integer of 2 to 30. stirring an aromatic carboxylic acid or an alkali metal As specific examples of the ethers, ethers such as eth salt thereof with a metal hdyroxide, sulfate or nitrate in ylene glycol monomethyl ether, diethylene glycol O the presence of an alkali. In this procedure, the pH monomethyl ether, diethylene glycol mono-n-butyl value, temperature and pressure are not critical. ether, ethylene glycol monophenyl ether, diethylene The aromatic carboxylic acid is preferably repre glycol dimethyl ether, 3-methoxybutyl acetate, ethyl ene glycol monoethyl ether, ethylene glycol diethyl sented by the formula: ether, diethylene glycol acetate monoethyl ether, ethyl 15 COOH COOH ene glycol diphenyl ether, ethylene glycol dimethyl ether, ethylene glycol monobutyl ether, ethylene glycol monopropyl ether, ethylene glycol monobenzyl ether, ethylene glycol monooctyl ether, ethylene glycol Or monododecyl ether, diethylene glycol monoethyl ether, 2O (R), (R) dipropylene glycol monomethyl ether, polyoxyethylene cetyl alcohol ether, polyoxyethylene oleyl alcohol ether, polyoxyethylene stearyl alcohol ether, polyoxy wherein R may be the same or different and represents ethylene lauryl alcohol ether, polyoxethylene octyl al a hydrogen atom, a hydroxy group, a halogen atom cohol ether, polyoxyethylene butyl alcohol ether, poly 25 oxyethylene nonyphenol ether, etc are suitable.
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